Dang!
I searched the attic for some stuff and stumbled upon two keyboards of me ex-roommate. I have no idea what brand the first one is. Here are some pics of the cleaning process:
First, I popped it open. Literally, there weren't any screws.

Crumble-tastic!

The numlock, roll and capslock have integrated LEDs - nice! And yay, a spring!

Circuit board on the back. The IC reads Intel.

Sticker on the backside.

Decrumbled....

... and put together with every key cleaned seperatly.

The typing is very smooth and very quiet. Feels nice =)
Next one:
Obviously a Commodore.

No doubt - a Commodore


... for Windows. Din AT-Jack. (What a crumbly mess, btw)

Sticker on the backside.

Unfortunatly, the Commodore is strongly yellowed.
That's all - have fun identifying the first one!